Bootstrap CSS组件之下拉菜单(dropdown)

Bootstrap下拉菜单，常用在开发项目中，今天为大家介绍介绍

dropdown、dropdown-menu、dropdown-header、divider、dropdown-submenu
例子见下拉菜单.html

//源码
.dropup,
.dropdown {
 position: relative;
}
.dropdown-toggle:focus {
 outline: 0;
}
.dropdown-menu {
 position: absolute;
 top: 100%;
 left: 0;
 z-index: 1000;
 display: none;
 float: left;
 min-width: 160px;
 padding: 5px 0;
 margin: 2px 0 0;
 font-size: 14px;
 text-align: left;
 list-style: none;
 background-color: #fff;
 -webkit-background-clip: padding-box;
     background-clip: padding-box;
 border: 1px solid #ccc;
 border: 1px solid rgba(0, 0, 0, .15);
 border-radius: 4px;
 -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
     box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
}
.dropdown-menu.pull-right {
 right: 0;
 left: auto;
}
.dropdown-menu .divider {
 height: 1px;
 margin: 9px 0;
 overflow: hidden;
 background-color: #e5e5e5;
}
.dropdown-header {
 display: block;
 padding: 3px 20px;
 font-size: 12px;
 line-height: 1.42857143;
 color: #777;
 white-space: nowrap;
}

<!DOCTYPE html>
<html lang="en">
 <head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <!-- Bootstrap从3.0版本开始全面支持移动平台，贯彻移动先行宗旨 -->
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <title>Bootstrap 101 Template</title>

  <!-- Bootstrap -->
  <link href="bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet">

 </head>
 <body>
  <!-- -->
  <div class="btn-group">
    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
      我的书籍<span class="caret"></span>
    </button>
    <ul class="dropdown-menu">
      <li><a href="#">编程</a></li>
      <li><a href="#">设计</a></li>
      <li><a href="#">深入</a></li>
    </ul>
  </div>

  <!-- dropdown/dropdown-menu/dropdown-header -->
  <div class="dropdown">
    <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
      我的书籍<span class="caret"></span>
    </button>
    <ul class="dropdown-menu">
      <li class="dropdown-header">前端</a></li>
      <li><a href="#">JS</a></li>
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li class="divider"></li>
      <li class="dropdown-header">后台</li>
      <li><a href="#">PYTHON</a></li>
      <li><a href="#">JAVA</a></li>
    </ul>
  </div>

  <!-- bootstrap是基于jQuery-->
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
  <script src="bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
 </body>
</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。